function isEmailValid(emailstring) {
	if (!emailstring.match(/^[a-z0-9+]{1}[a-z_0-9-\.]*@[a-z0-9]{1}[a-z0-9-]*(\.[a-z0-9]{1}[a-z0-9-]*)+$/gi)) {
		return false;
	}
	return true;
}

inWin = null;
function openwindow(strona,width,height) {
    if (navigator.appName == "Microsoft Internet Explorer") {
        inWin = window.open(String(strona), 'inWin', "toolbar=no,menubar=no,scrollbars=auto,resizable=yes,status=no,location=no,directories=no,fullscreen=no,titlebar=no,width=" + String(width) + ",height=" + String(height));
    } else {
        inWin = window.open(String(strona), 'inWin', "toolbar=no,location=no,directories=no,status=no,menubar=no,resizable=yes,innerWidth=" + String(width) + ",innerHeight=" + String(height));
    }
    inWin.focus();
}

function open_popup(_url,_width, _height) {
    if (_width<1) { _width = 300; }
    if (_height<1) { _height = 300; }
    window.open(_url,'popupwin','status=no,width='+(_width+20)+',height='+(_height+20)+',screenX=50,screenY=50,left=50,top=50,scrollbars=yes,resizable=yes');
}

function wyslijZnajomemu(article, lang) {
    openwindow('http://www.hip.pl/intel/sendToFriend1.php/'+lang+'/'+article,330,180);
}